Bought this in addition to the Scout Pro 2 LT tester and remote kit. These two sets complement each other perfectly. When working on new setups we use them for each termination, order passage and approx distances. Then, on the final pass, we use 19 mapping consoles to quickly label each port. In existing installations we use them to detect short circuits and other errors. Ultimately, these kits saved us hours, time, and money.